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The Dumbbell Nebula

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#1 JOEC.

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Posted 09 July 2020 - 07:29 AM

Well the sky cleared up last night after about 2 weeks of junk. Managed about 45 minutes with below average transparency before it got out of hand and I had to stop. This is 23 120s subs with darks flats and bias using a QHY168C and 6" Astrograph processed in APP and PSE. I think I have my corrector set just about right now with a 3mm spacer. This is cropped but the original show very little egg shaped stars on the corners. I think the focus is good. According to APT bahtinov aid this was at if I remember about -06.

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#2 sunnyday

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Posted 09 July 2020 - 07:35 AM

sharp image , love the details and colors , thanks .



#3 elmiko

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Posted 09 July 2020 - 09:26 AM

If you have elongated stars in the corners your backspace is not correct. You need more backspace. Agena Astro sales a set of Delrin spacers that vary in thickness for a few dollars. Nice image by the way!



#4 JOEC.

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Posted 09 July 2020 - 12:26 PM

If you have elongated stars in the corners your backspace is not correct. You need more backspace. Agena Astro sales a set of Delrin spacers that vary in thickness for a few dollars. Nice image by the way!

Yep i have tried some and this is as close as I am going to go.. I usually do some cropping after stacking to clean up the frame edges so cropping another section around the image will not hurt. I really dislike having to experiment with this and having to test and not just image. This is the image uncropped except for cropping out the stack image edges. I do see some egg shaped stars in the corners but I can either live with that or crop.

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#5 JOEC.

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Posted 12 July 2020 - 03:02 PM

More data added about 75 minutes

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